Heat-resistant molded article of lactic acid-base polymer
    45.
    发明授权
    Heat-resistant molded article of lactic acid-base polymer 失效
    乳酸基聚合物耐热成型品

    公开(公告)号:US5691424A

    公开(公告)日:1997-11-25

    申请号:US450927

    申请日:1995-05-25

    IPC分类号: C08L67/02 C08L67/04

    CPC分类号: C08L67/02 C08L67/04

    摘要: A preparation process of heat-resistant molded articles of a lactic acid-based polymer comprising mixing the lactic acid-based polymer and poly-.epsilon.-caprolactone so as to obtain a L-lactic acid ratio of 75% by weight or more, adding to the polymer mixture a crystalline inorganic powder containing 50% by weight or more of SiO.sub.2, melt-kneading the resultant composition, filling the same into a mold which is set at 85.degree..about.125.degree. C. and forming a shape while promoting crystallization. The molded articles have excellent heat resistance and impact strength, are suitably used for food trays and beverage cups, and can be degraded, in the case of waste, into nontoxic water and carbon dioxide like natural products within a relatively short period in the natural environment.

    摘要翻译: 一种乳酸类聚合物的耐热成型体的制备方法,其特征在于,将乳酸类聚合物和聚ε-己内酯混合,得到75重量%以上的L-乳酸比例,添加到 聚合物混合物是含有50重量%以上SiO 2的结晶无机粉末,将所得组合物熔融捏合,将其填充到设定在85℃125℃的模具中并形成同时促进结晶。 模塑制品具有优异的耐热性和冲击强度,适用于食品托盘和饮料杯,并且在废物的情况下可以在自然环境相对短的时间内降解成无毒的水和二氧化碳如天然产物 。

    Degradable container
    46.
    发明授权
    Degradable container 失效
    可降解容器

    公开(公告)号:US5409751A

    公开(公告)日:1995-04-25

    申请号:US32284

    申请日:1993-03-17

    摘要: A degradable container which is excellent in transparency and impact strength and can be decomposed into nontoxic water and carbon dioxide in the natural environment within a relatively short period can be obtained by using the process for molding a container of an arbitrary shape from a thermoplastic composition having polylactic acid of lactic acids or a copolymer of lactic acids and other hydroxycarboxylic acids as a main component, preforming the composition and thereafter molding the container in a temperature range from Tg to Tg+60.degree. C. on the basis of the glass transition temperature Tg of the thermoplastic polymer composition and under the condition of a draw ratio of 6 times or less.

    摘要翻译: 通过使用从具有任意形状的容器成型任意形状的容器的方法可以获得透明度和冲击强度优异并且可以在相对较短的时间内在自然环境中分解成无毒水和二氧化碳的可降解容器,该方法由具有 乳酸的聚乳酸或乳酸与其它羟基羧酸的共聚物作为主要成分,预先形成组合物,然后基于玻璃化转变温度Tg在Tg至Tg + 60℃的温度范围内成型容器 的热塑性聚合物组合物,并且在拉伸比为6倍以下的条件下进行。

    Production process of chlorine
    50.
    发明授权
    Production process of chlorine 失效
    氯的生产过程

    公开(公告)号:US4774070A

    公开(公告)日:1988-09-27

    申请号:US13426

    申请日:1987-02-11

    IPC分类号: C01B7/04 C01B7/07

    CPC分类号: C01B7/04 C01B7/0743

    摘要: Chlorine is produced by oxidizing byproduced hydrogen chloride. An offgas containing hydrogen chloride as a byproduct is reacted with oxygen at 300.degree.-500.degree. C. in the presence of a catalyst which contains chromic oxide (Cr.sub.2 O.sub.3) as a principal component. The resulting gas is cooled rapidly and then washed with water to recover vaporized chromium. The hydrogen chloride is then absorbed in water to recover it as an aqueous hydrochloric acid solution. The still remaining portion of the resultant gas is washed with sulfuric acid to remove water from the same, followed by compression and cooling. The resulting liquefied chlorine is separated. The still remaining gas composed principally of oxygen is thereafter returned to the oxidation step.

    摘要翻译: 通过氧化副产生的氯化氢产生氯。 在含有氧化铬(Cr 2 O 3)作为主要成分的催化剂的存在下,将含有氯化氢作为副产物的废气在300-500℃下与氧气反应。 将所得气体快速冷却,然后用水洗涤以回收蒸发的铬。 然后将氯化氢吸收在水中,以盐酸水溶液的形式回收。 所得气体的剩余部分用硫酸洗涤以从其中除去水,然后压缩和冷却。 所得到的液化氯被分离。 然后主要由氧气组成的剩余气体返回氧化步骤。